No? MI3 is set after MI2, after Guybrush escapes from the Carnival of the Damned. And MI4 certainly takes place after MI3: you can see flashbacks in the opening scene, and Guybrush is married to Elaine

And as to the hacks, I would really like to see a "The Monkeys are Listening Edition" That would be nice!^^

Wow, now that you think of it, Guybrush spent an entire year at LeChuck's carnival.

Or at least enough time to celebrate a birthday.

For example: He could have been 19 on July 20th in Monkey Island 2, and his birthday could have happened on July 21, then he'd technically be 20 in Curse of Monkey Island, even if the two games were just days apart.

Other than that, I think "fixing" Guybrush and LeChuck is a reasonable task within reach.

Looking on how Irishmile modified the MI:SE Guybrush, we might can convince him to work on it:

The right one is actually a nearly pixel-perfect modification of the MI:SE sprite, just with "better" hair. Given that his head is quite static most of the time there are not THAT many different perspectives to draw.

Better than that is the original look planned for guybrush in the MI2:SE. Too bad they dropped this sketch right from the start. It had so much appeal and expressivity. Would kill for anyone who could do a replacement mod based on this.